Warning: file_put_contents(): Only 0 of 7854 bytes written, possibly out of free disk space in /home/www/wwwroot/ndsq.cn/index.php on line 55 half of thread angle是什么意思，half of thread angle的翻译，half of thread angle音标、读音、用法和例句_开心英文字典_柠咚词
This paper describes a new method and device for measuring helical line, pitch diameter, taper and half-angle of thread of petroleum thread gauges. 本文介绍一种测量石油螺纹量规的螺旋线、中径、锥度和牙形半角的新方法及装置。